I am getting warnings about my docker disk utilization and I am trying to figure out what is causing it. I currently have the disk set to 50GB and it's saying 77% is being used and it's climbing. Here is the output of docker system df -v. I am not seeing it, am I missing something?

https://pastebin.com/DD4kcTkM

What does Container Size report on the docker tab?

I'm seeing the same thing. Dashboard reports I'm using 83% of my 16GB docker image. A report on container size shows I'm only using 4GB. Numbers are not adding up. The main thing that caught my attention is directory /var/lib/docker/btrfs is using 42GB? Confused.

The usual reason for filling docker.img is an application writing to a path that isn't mapped. 20G is usually more than enough. I have 17 dockers and they use less than half of 20G.